The bulk update request #11116 is pending approval.

create implication muffled_speech (587) -> muffled (4204)
create implication muffled_screaming (281) -> muffled (4204)
create implication muffled_moaning (221) -> muffled (4204)
create implication muffled_sounds (23) -> muffled (4204)
create alias muffled_scream (42) -> muffled_screaming (281)

Reason: All these categories can be gathered under "muffled".